Scanalogic

[ikalogic]

how code or al goritma this project.....
in this project only found .hex fireware....

search the pages of this forum, the code is provided many times, by me and others that modified it!

[Pantomas]

I have built scanlogic according to the specified pattern with a ATMEGA16 16PU quartz and 16MHz. I use an external power supply (pin 4 - off). Unfortunately I can not run it and every time I have a message like the attached picture . I tried to swap pins 2 and 3 in the plug dsub9 and it is always the same. The processor is working (I think) because the LED is lit. I tried it on another computer. I'm using Windows XP Pro SP3. This may fuse bits? I set ('0') CKOPT, BOOTSZ1, BOOTSZ0, SUT1, SUT0

scanlogic.JPG

[megaboy]

if the microcontroller is working the problem may be in the 7400 connection
please double check it and never give up , it'll work

[Pantomas]

After the problem . I had micro short circuit on the pcb beetwin wires pin 1 and pin 7 of 7400. Just all is OK! Thnx to Megaboy

[Ragnol]

Hi all. First i am sorry for my english. I built one with mega8 and have problem with software. Runs ok. Comunications OK. But when i read all samples and use cursors the some error with it. The measure freq. is not right. The delta is 14.78ms. Thi right freq. for 14.78 is 67.57Hz. But the Scanalogic print 101.4Hz. I use 50 kHz sampilg rate. On another sampling rate the freq. is right.



Thanks for answer. Ragnol

[megaboy]

which frequency you are working at ?
in the Hardware configuration did you put the right value of the frequency that you are using ?
in the sampling rate tab , what the sampling rate did you enter?

[Ragnol]

which frequency you are working at ?
in the Hardware configuration did you put the right value of the frequency that you are using ?
in the sampling rate tab , what the sampling rate did you enter?

Crystal freq. is 8Mhzm Yes I have right value in software. Because in another sample rate as 50kHz the frequency is true. See the picture. Measure delta is 14.78ms. This is 67,57Hz but software shown more then 100Hz. Not problem with measuring, setings , but only in math. Delta is true. Freq. of measure signal isn´t .

[megaboy]

The software is modifying by ikalogic now , so if if you have any notes or suggestion please post it here to add/modify it in the future.

[Ragnol]

Today, I built one with ATmega8 on PCB with FT232RL.

Photos :

http://vancs.sweb.cz/log2/P1010216.JPG
http://vancs.sweb.cz/log2/P1010217.JPG
http://vancs.sweb.cz/log2/P1010220.JPG
http://vancs.sweb.cz/log2/P1010222.JPG
http://vancs.sweb.cz/log2/P1010223.JPG

PCB in Eagle 5.4.0

Thanks a lot for ikalogic ! Nice work ! And thanks for cyn too !

[megaboy]

Nice job Ragnol !

[jamesjam]

1. i cannot download a file for scanalogic

[Pantomas]

I thought that I already have end of problems with the interface , unfortunately not ...
I decided to check whether scanlogic is working properly. I wanted to see what comparator has on output so I connected probe to an external CAN bus and Scanlogic nothing sniffed, although the signal LED flash (on end off comparator). I thought that something is wrong with Scanlogic. So I wrote a simple code for ATmega8:

#define F_CPU 1000000
#include <avr/io.h>
#include <avr/delay.h>

int main ()
{
DDRC=0x01;
while (1)
{
PORTC=0x01;
_delay_us(30);
PORTC=0x00;
_delay_us(10);
}
}

Unfortunately Scanlogic not show what it should . You can see:

fig1.jpg

In addition, I noticed strange signals on all lines at the end of samples (fig2)

fig2.jpg

These signals always occur even when lines are not connected (fig3)

fig3.jpg

I don't know where is the mistake
I checked 10 times the combination of elements, replaced quartz, 7400. I tried to hex 8, 12,16MHz with other relevant oscilators and nothing has changed. I changed uC to second one Atmega16 16PU and... that same. I think that the oscillator & 7400 are working properly because it is communication between the uC and the RS232 and the program works. I do not know what to do. Maybe the wrong setting of FUSE BITS I set CKOPT, BOOTSZ0, BOOTSZ1, SPIEN, SUT1, SUT0, CKSEL0. I tryed other fuse bits config too but without possitive results
I have a question about the probe-line. Why are they all "pull-up"?
PAntomas

[megaboy]

which micricontroller you are using ?
are you using the same firmware with the same frequency?

[Pantomas]

I used Atmega16 16PU with 16MHz crystall & hex for it, 12MHz crystall & hex for it and 8 MHz & hex for it ... so I'm using the same firmware with the same frequency.

[erdeszbacsi]

Hi!
Can anyone tell me please, where is D2 on the schematic? I cant see:S
Thanks!